Abstract Herein, biodegradable poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P34HB) was mixed with amorphous poly(vinyl acetate) (PVAc) to prepare a binary blend system by melt compounding. The miscibility, thermal behavior, isothermal crystallization behaviors, and mechanical and rheological properties of P34HB/PVAc blends were investigated. Only one glass transition temperature of the blends indicated that P34HB and PVAc were miscible. The introduction of PVAc suppressed the cold crystallization of the blends and reduced the degree of crystallinity. The study of isothermal crystallization behaviors revealed that the addition of amorphous PVAc reduced the crystallization rate of blends, but did not change the crystallization mechanism. In addition, the blends showed a remarkable improvement in the rheological properties compared with those of neat P34HB. The most intriguing result was a greatly increased elongation at break, coupled with an only slightly reduced modulus and strength for blends.

中文翻译：

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可生物降解的聚（3-羟基丁酸酯-co-4-羟基丁酸酯）/聚（醋酸乙烯酯）共混物的混溶性、结晶性、流变学和机械性能

摘要 在本文中，将可生物降解的聚（3-羟基丁酸酯-共-4-羟基丁酸酯）（P34HB）与无定形聚（醋酸乙烯酯）（PVAc）混合，通过熔融复合制备二元共混体系。研究了 P34HB/PVAc 共混物的混溶性、热行为、等温结晶行为以及机械和流变性能。只有一种共混物的玻璃化转变温度表明 P34HB 和 PVAc 是可混溶的。PVAc的引入抑制了共混物的冷结晶并降低了结晶度。等温结晶行为的研究表明，无定形PVAc的加入降低了共混物的结晶速率，但没有改变结晶机制。此外，与纯 P34HB 相比，共混物的流变性能显着改善。最有趣的结果是断裂伸长率大大增加，而共混物的模量和强度仅略有降低。